Failure to see more than one change at a time

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Abstract
The ability of observers to detect the presence of more than one change at a time was tested using a sequence of displays that always contained two simple items (e.g. rectangles) with constant locations. Each feature that was examined (orientation, color, and size) had two possible values for each item: A or A′ for item 1, and B or B′ for item 2. On half the trials the display sequence was such that only one change occurred at a time (e.g. AB, A′ B, A′B′, AB′); on the other half, it was such that a pair of changes occurred on every other transition (e.g., AB, A′B′, A′B, AB′). The task of the observer was to determine whether the display sequence in a given trial contained any change pairs.

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